Re: [Bug 10648] CONFIG_PRINTK_TIME broken on git HEAD ?

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

Subject: sched: fix sched_clock_cpu()
From: Peter Zijlstra <a.p.zijlstra@chello.nl>

Make sched_clock_cpu() return 0 before it has been initialised and avoid
corrupting its state due to doing so.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 kernel/sched_clock.c |   18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

Index: linux-2.6/kernel/sched_clock.c
===================================================================
--- linux-2.6.orig/kernel/sched_clock.c	2008-05-13 18:40:35.000000000 +0200
+++ linux-2.6/kernel/sched_clock.c	2008-05-13 18:42:05.000000000 +0200
@@ -60,22 +60,26 @@
 	return &per_cpu(sched_clock_data, cpu);
 }
 
+static __read_mostly int sched_clock_running;
+
 void sched_clock_init(void)
 {
 	u64 ktime_now = ktime_to_ns(ktime_get());
-	u64 now = 0;
+	unsigned long now_jiffies = jiffies;
 	int cpu;
 
 	for_each_possible_cpu(cpu) {
 		struct sched_clock_data *scd = cpu_sdc(cpu);
 
 		scd->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
-		scd->prev_jiffies = jiffies;
-		scd->prev_raw = now;
-		scd->tick_raw = now;
+		scd->prev_jiffies = now_jiffies;
+		scd->prev_raw = 0;
+		scd->tick_raw = 0;
 		scd->tick_gtod = ktime_now;
 		scd->clock = ktime_now;
 	}
+
+	sched_clock_running = 1;
 }
 
 /*
@@ -137,6 +141,9 @@
 	struct sched_clock_data *scd = cpu_sdc(cpu);
 	u64 now, clock;
 
+	if (unlikely(!sched_clock_running))
+		return 0ull;
+
 	/*
 	 * Normally this is not called in NMI context - but if it is,
 	 * trying to do any locking here is totally lethal.
@@ -182,6 +189,9 @@
 	struct sched_clock_data *scd = this_scd();
 	u64 now, now_gtod;
 
+	if (unlikely(!sched_clock_running))
+		return;
+
 	WARN_ON_ONCE(!irqs_disabled());
 
 	now = sched_clock();